Airbag worries

YOU don't say whether your daughter was injured. If she wasn't, the car's body and the seat belts did their job and there was no need for the airbags to deploy. Seat belts are the first line of protection and the airbags are deployed only in a severe crash. Your daughter was travelling at the local speed limit before the crash. I'll assume that's 50km/h. She probably braked immediately before hitting the stationary 4WD, so the speed of impact was less than, say, 40km/h. The energy involved should easily have been absorbed by the car's body and the seat belts. Had the airbags deployed, the damage to the car from the airbags inflating would have been more extensive.